I have previously only done 2d games (2 in game jams since Nov24) and I thought I would do the same for this one given there was only 2 days.
After the theme was announced I really wanted to try 3D and thought I would not be able to submit since I also had to learn.
I was able to submit a really simple game with the core mechanic I had in mind and I spent a day just learning the basic nodes and import of 3d objects.
I feel good about making that decision.